Focus event on windows don't fired

Hello,

I've been trying to fire teh "focus" event when an ext window is focused, but nothing happens when occurs this. I'm working with 4.1 version of extJS, and other events, like "beforeclose" or "minimize" are executing properly. Could be an error related to this event? (I've seen in other thread this event is failing with another component).

It didn't work for me, but I got a kind of simulation of the focus event: I've get the html element directly by its id, and I add the event listener to the div that contains the window. It's rare that some events aren't fired when are assigned to an ext window.